They identified four different lead-based substances, two of which were man-made, not natural.
他们鉴定出四种不同的含铅物质，其中两种是人工合成的，并非天然物质。
Based on this thought, Spinoza has proved the natural right that everyone is equal.
以这一思想为基础，斯宾诺莎论证了在自然权利的问题上人人平等。
A correct grasp of natural law is based on an exact understanding of the nature.
对自然法的理解是建立在对自然概念的准确把握之基础上的。
Natural pharmaceutical chemistry, based on experiment, has much to do with society and environment.
天然药物化学是一门以实验为基础的科学，它与社会、环境紧密联系。
Natural pharmaceutical chemistry, based on experiment, has much to do with society and environment.
天然药物化学是一门以实验为基础的科学，它与社会、环境紧密联系。
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